/*
*********************************************************************************************************
*                                             uC/GUI V3.98
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              �C/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : GUI_DrawGraphEx.c
Purpose     : Implementation of GUI_DrawGraphEx
---------------------------END-OF-HEADER------------------------------
*/

//#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Protected.h"

/*********************************************************************
*
*       Defines
*
**********************************************************************
*/
#define SWAPSIGN        1
#define SWAPSIGN_DIVIDE 2
#define DIVIDE          3
#define MULTIPLY        4
#define MULTIPLY_DIVIDE 5

/*********************************************************************
*
*       Static code
*
**********************************************************************
*/
/*********************************************************************
*
*       _DrawGraph
*/
static void _DrawGraph(I16 * pay, I32 NumPoints, I32 xOff, I32 yOff, I32 Numerator, I32 Denominator)
{
	I32 i;
	I32 y0, y1;
	I32 yClip0, yClip1;
	I32 Method;
	/* Perform high level clipping in x */
	yClip0 = GUI_Context.pClipRect_HL->y0;
	yClip1 = GUI_Context.pClipRect_HL->y1;
	if ((Numerator == 0) || (Denominator == 0) || (NumPoints <= 0)) {
		return;
	}
	if (Numerator == -1) {
		if (Denominator == 1) {
			Method = SWAPSIGN;
		} else {
			Method = SWAPSIGN_DIVIDE;
		}
	} else if (Numerator == 1) {
		if (Denominator == 1) {
			Method = 0;
		} else {
			Method = DIVIDE;
		}
	} else {
		if (Denominator == 1) {
			Method = MULTIPLY;
		} else {
			Method = MULTIPLY_DIVIDE;
		}
	}
	i = 0;
	if (GUI_Context.pClipRect_HL) {
		if (xOff < GUI_Context.pClipRect_HL->x0) {
			i = GUI_Context.pClipRect_HL->x0 - xOff;
		}
		if (xOff + NumPoints - 1 > GUI_Context.pClipRect_HL->x1) {
			NumPoints = GUI_Context.pClipRect_HL->x1 - xOff + 1;
		}
	}
	/* Start drawing if there is something left to do after x-clipping */
	if (i < NumPoints) {
		switch (Method) {
			case SWAPSIGN:
				y0 = -*(pay + i++) + yOff;
				break;
			case SWAPSIGN_DIVIDE:
				y0 = (U32)(-*(pay + i++) + yOff) / (U32)Denominator;
				break;
			case DIVIDE:
				y0 = (U32)(*(pay + i++) + yOff) / (U32)Denominator;
				break;
			case MULTIPLY:
				y0 = (U32)(*(pay + i++) + yOff) * (U32)Numerator;
				break;
			case MULTIPLY_DIVIDE:
				y0 = (U32)(*(pay + i++) + yOff) * (U32)Numerator / (U32)Denominator;
				break;
			default:
				y0 = *(pay + i++) + yOff;
			break;
		}
		/* Iterate */
		for (; i < NumPoints; i++) {
		/* Perform high level clipping in y */
			switch (Method) {
			case SWAPSIGN:
				y1 = -*(pay + i) + yOff;
				break;
			case SWAPSIGN_DIVIDE:
				y1 = (U32)(-*(pay + i) + yOff) / (U32)Denominator;
				break;
			case DIVIDE:
				y1 = (U32)(*(pay + i) + yOff) / (U32)Denominator;
				break;
			case MULTIPLY:
				y1 = (U32)(*(pay + i) + yOff) * (U32)Numerator;
				break;
			case MULTIPLY_DIVIDE:
				y1 = (U32)(*(pay + i) + yOff) * (U32)Numerator / (U32)Denominator;
				break;
			default:
				y1 = *(pay + i) + yOff;
			break;
		}
		if ((y0 >= yClip0) || (y1 >= yClip0)) {
			if ((y0 <= yClip1) || (y1 <= yClip1)) {
				I32 y01;
				y01 = (y1 + y0) / 2;
				if (y0 <= y1) {
					LCD_DrawVLine(i + xOff - 1, y0, y01);
					LCD_DrawVLine(i + xOff, y01, y1);
				} else {
					LCD_DrawVLine(i + xOff - 1, y01, y0);
					LCD_DrawVLine(i + xOff, y1, y01);
				}
			}
		}
		y0 = y1;
		}
	}
}

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       GUI_DrawGraphEx
*/  
void GUI_DrawGraphEx(I16 *pay, I32 NumPoints, I32 x0, I32 y0, I32 Numerator, I32 Denominator)
{
#if (GUI_WINSUPPORT)
	WM_ADDORG(x0,y0);
#endif
	_DrawGraph(pay, NumPoints, x0, y0, Numerator, Denominator);
}

/*************************** End of file ****************************/
	 	 			 		    	 				 	  			   	 	 	 	 	 	  	  	      	   		 	 	 		  		  	 		 	  	  			     			       	   	 			  		    	 	     	 				  	 					 	 			   	  	  			 				 		 	 	 			     			 
